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authorJacob McDonnell <jacob@jacobmcdonnell.com>2026-04-25 19:59:05 -0400
committerJacob McDonnell <jacob@jacobmcdonnell.com>2026-04-25 19:59:05 -0400
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-<table class="head">
- <tr>
- <td class="head-ltitle">UCOM(4)</td>
- <td class="head-vol">Device Drivers Manual</td>
- <td class="head-rtitle">UCOM(4)</td>
- </tr>
-</table>
-<div class="manual-text">
-<section class="Sh">
-<h1 class="Sh" id="NAME"><a class="permalink" href="#NAME">NAME</a></h1>
-<p class="Pp"><code class="Nm">ucom</code> &#x2014; <span class="Nd">USB tty
- support</span></p>
-</section>
-<section class="Sh">
-<h1 class="Sh" id="SYNOPSIS"><a class="permalink" href="#SYNOPSIS">SYNOPSIS</a></h1>
-<p class="Pp">To compile this driver into the kernel, place the following line
- in your kernel configuration file:</p>
-<div class="Bd Pp Bd-indent"><code class="Cd">device ucom</code></div>
-<p class="Pp">Alternatively, to load the driver as a module at boot time, place
- the following line in <a class="Xr">loader.conf(5)</a>:</p>
-<div class="Bd Pp Bd-indent Li">
-<pre>ucom_load=&quot;YES&quot;</pre>
-</div>
-</section>
-<section class="Sh">
-<h1 class="Sh" id="DESCRIPTION"><a class="permalink" href="#DESCRIPTION">DESCRIPTION</a></h1>
-<p class="Pp">The <code class="Nm">ucom</code> driver attaches to USB modems,
- serial ports, and other devices that need to look like a tty. The
- <code class="Nm">ucom</code> driver shows a behavior like a
- <a class="Xr">tty(4)</a>. This means that normal programs such as
- <a class="Xr">tip(1)</a> or <a class="Xr">ppp(8)</a> can be used to access
- the device.</p>
-</section>
-<section class="Sh">
-<h1 class="Sh" id="SYSCTL_VARIABLES"><a class="permalink" href="#SYSCTL_VARIABLES">SYSCTL
- VARIABLES</a></h1>
-<p class="Pp">The following variables are available as both
- <a class="Xr">sysctl(8)</a> variables and <a class="Xr">loader(8)</a>
- tunables:</p>
-<dl class="Bl-tag">
- <dt id="hw.usb.ucom.debug"><var class="Va">hw.usb.ucom.debug</var></dt>
- <dd>Debug output level, where 0 is debugging disabled and larger values
- increase debug message verbosity. Default is 0.</dd>
- <dt id="hw.usb.ucom.device_mode_console"><var class="Va">hw.usb.ucom.device_mode_console</var></dt>
- <dd>When set to 1, the <code class="Nm">ucom</code> driver will mark terminals
- as console devices when operating in device mode. Default is 1.</dd>
- <dt id="hw.usb.ucom.pps_mode"><var class="Va">hw.usb.ucom.pps_mode</var></dt>
- <dd>Enables and configure PPS capture mode as described below.</dd>
-</dl>
-</section>
-<section class="Sh">
-<h1 class="Sh" id="Pulse_Per_Second_(PPS)_Timing_Interface"><a class="permalink" href="#Pulse_Per_Second_(PPS)_Timing_Interface">Pulse
- Per Second (PPS) Timing Interface</a></h1>
-<p class="Pp">The <code class="Nm">ucom</code> driver can capture PPS timing
- information as defined in RFC 2783. The API, accessed via
- <a class="Xr">ioctl(2)</a>, is available on the tty device. To use the PPS
- capture feature with <a class="Xr">ntpd(8)</a>, symlink the tty device to
- <var class="Va">/dev/pps0.</var></p>
-<p class="Pp">The <var class="Va">hw.usb.ucom.pps_mode</var> sysctl configures
- the PPS capture mode. It can be set in <a class="Xr">loader.conf(5)</a> or
- <a class="Xr">sysctl.conf(5)</a>. The following capture modes are
- available:</p>
-<div class="Bd-indent">
-<dl class="Bl-tag Bl-compact">
- <dt>0</dt>
- <dd>Capture disabled (default).</dd>
- <dt>1</dt>
- <dd>Capture pulses on the CTS line.</dd>
- <dt>2</dt>
- <dd>Capture pulses on the DCD line.</dd>
-</dl>
-</div>
-</section>
-<section class="Sh">
-<h1 class="Sh" id="FILES"><a class="permalink" href="#FILES">FILES</a></h1>
-<dl class="Bl-tag Bl-compact">
- <dt><span class="Pa">/dev/ttyU*</span></dt>
- <dd>for callin ports</dd>
- <dt><span class="Pa">/dev/ttyU*.init</span></dt>
- <dd style="width: auto;">&#x00A0;</dd>
- <dt><span class="Pa">/dev/ttyU*.lock</span></dt>
- <dd>corresponding callin initial-state and lock-state devices
- <p class="Pp"></p>
- </dd>
- <dt><span class="Pa">/dev/cuaU*</span></dt>
- <dd>for callout ports</dd>
- <dt><span class="Pa">/dev/cuaU*.init</span></dt>
- <dd style="width: auto;">&#x00A0;</dd>
- <dt><span class="Pa">/dev/cuaU*.lock</span></dt>
- <dd>corresponding callout initial-state and lock-state devices</dd>
-</dl>
-</section>
-<section class="Sh">
-<h1 class="Sh" id="SEE_ALSO"><a class="permalink" href="#SEE_ALSO">SEE
- ALSO</a></h1>
-<p class="Pp"><a class="Xr">cu(1)</a>, <a class="Xr">tty(4)</a>,
- <a class="Xr">uark(4)</a>, <a class="Xr">ubsa(4)</a>,
- <a class="Xr">ubser(4)</a>, <a class="Xr">uchcom(4)</a>,
- <a class="Xr">ucycom(4)</a>, <a class="Xr">ufoma(4)</a>,
- <a class="Xr">uftdi(4)</a>, <a class="Xr">uhso(4)</a>,
- <a class="Xr">uipaq(4)</a>, <a class="Xr">umcs(4)</a>,
- <a class="Xr">umct(4)</a>, <a class="Xr">umodem(4)</a>,
- <a class="Xr">umoscom(4)</a>, <a class="Xr">uplcom(4)</a>,
- <a class="Xr">usb(4)</a>, <a class="Xr">uslcom(4)</a>,
- <a class="Xr">uvisor(4)</a>, <a class="Xr">uvscom(4)</a>,
- <a class="Xr">ttys(5)</a></p>
-</section>
-<section class="Sh">
-<h1 class="Sh" id="HISTORY"><a class="permalink" href="#HISTORY">HISTORY</a></h1>
-<p class="Pp">The <code class="Nm">ucom</code> driver was adopted from
- <span class="Ux">NetBSD</span> in March of 2002. This manual page was
- adopted from <span class="Ux">NetBSD</span> by <span class="An">Tom
- Rhodes</span>
- &lt;<a class="Mt" href="mailto:trhodes@FreeBSD.org">trhodes@FreeBSD.org</a>&gt;
- in April 2002.</p>
-</section>
-<section class="Sh">
-<h1 class="Sh" id="BUGS"><a class="permalink" href="#BUGS">BUGS</a></h1>
-<p class="Pp">Prior to <span class="Ux">FreeBSD 6.0</span>
- <code class="Nm">ucom</code> created <span class="Pa">/dev/ucom?</span>
- rather than the uniform device names created today. Old scripts must be
- adjusted accordingly.</p>
-</section>
-</div>
-<table class="foot">
- <tr>
- <td class="foot-date">July 11, 2020</td>
- <td class="foot-os">FreeBSD 15.0</td>
- </tr>
-</table>